Went through all the ‘narrator’ audio files and VOX “8” file one more time to quickly check if they didn’t have any metadata like the qecode.ogg (they don’t).
Does anyone know how to read metadata on .vtf files? If I understand correctly metadata is not an officially supported feature but nonetheless is quite possible? I am using VTFedit.
I looked into ‘high security’ wall panel screens, seen throughout the game but notably one behind Dr.Horns desk in Lab D. There’s a lot here to give me hope and a task tommorow. In short there is a set of special versions of this modified slightly (darker and squatter), with the name “panel_safe” rather than simply “wallunit_display”. There is also (for both versions), a set of images (stored as frames) for recognizing a proper passcode entry - of three ‘digits’. I’ve never seen this version of the display in game, and I’ve been paying attention to these weird little things whenever they’ve shown up, truly from the start of my first playthrough in the Steam version (they really do stand out, mostly due to the much higher than normal pixel density). There is also a distorted/failed version (one of several, the rest of which are fairly common in game) i’ve never seen (kind of bad looking hard cut to snowfield static, actually looks like nothing but an early version of the really cool final versions they wound up with, to me).

I hope there may be some sequence of actions to take to trigger this ‘safe’ (if that’s what it is) in Dr. Horns office to open (exactly like the undertow navy seal copypasta easter egg, which is now fully known). First I’ll check and look hard at it, and one other version in the final hall of QE before the ambush, to see which if either is the ‘safe’ version (i mention the second one in the final hall because it is attached to a different type of hardware than normal, off-center in a utility-box type thing), Note that it’s not just the picture above, or just a blinking version or whatever (which would make sense as a passive environmental feature, as though someone else had entered the code) - in the actual .vtf there are frames for each individual box being marked (only useful for the player seeing the code being entered, such as when entering it themselves).
I also dug up the aquatics lab screens I was talking about before (here rotated 90 degrees right for readability), the ones with the weird “Cubemap Samples” and “Niobium” references (as though they were chemical components of Xen water?). They’re stored in a metatexture used for several displays in-game, and I just noticed the paired data on the right which looks like it might have a binary (ascii/unicode) message in it? I’m also not positive if it actually appears in the game (easily could have and I just didn’t notice it, though). I’m legitimately too tired to do anything but go to sleep right now or I’d check before posting this.